From their About Us page
Social Expertise
Built social from the ground up with ?Facebook DNA?: Facebook?s Founding President, Sean Parker serves on Yammer?s Board of Directors
Yammer and Facebook share the same first investor, Peter Thiel; backed by Social+Capital Partnership ? a fund established by former Facebook Vice President, Chamath Palihapitiya
Our Customers
More than 80 percent of the Fortune 500® are using Yammer
Leading organizations including Deloitte, Ford, Nationwide, 7-Eleven, Orbitz Worldwide, Rakuten, and Telefonica O2 have adopted Yammer
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